js数字转换日期

let timestamp = 1633072800000; // 示例时间戳
let date = new Date(timestamp);
console.log(date.toString()); // 输出转换后的日期和时间

function formatDate(year, month, day) {
    // 注意：JavaScript中的月份是从0开始的，所以需要减1
    return new Date(year, month - 1, day);
}

let date = formatDate(2021, 10, 1);
console.log(date.toString()); // 输出 "Sat Oct 01 2021 ..."

function parseDateString(dateString) {
    let year = parseInt(dateString.substring(0, 4));
    let month = parseInt(dateString.substring(4, 6)) - 1;
    let day = parseInt(dateString.substring(6, 8));
    return new Date(year, month, day);
}

let date = parseDateString("20211001");
console.log(date.toString()); // 输出 "Sat Oct 01 2021 ..."

let timestampInSeconds = 1633072800; // 秒级时间戳
let timestampInMilliseconds = timestampInSeconds * 1000;
let date = new Date(timestampInMilliseconds);

let date = new Date(timestamp);
console.log(date.toLocaleString('en-US', { timeZone: 'UTC' })); // 输出UTC时区的日期和时间